Gated-TIMS NETD MS/MS analysis of a mixture of Compounds 3, 4 and 5 in the 3- charge state. (a-c) NETD spectra of peaks 1, 2, and 3, respectively, in Figure 2b. Sulfo losses are labeled as –S, fluoranthene adducts are indicated by +F, and the loss of the aminopentyl group is marked by –R. Measured m/z values for assigned peaks are shown in Supplementary Tables S4 – S6.